We carry local adjustments for a few gnulib modules via the
patches in gl/. Nearly all of those patches had become stale
due to evolution of the originals in gnulib.
To refresh them, first make sure you have no local changes in gl/
or in the gnulib submodule, then run "make refresh-gnulib-patches".
Counterpart to commit 8fe40b84bd, since test-link.c uses rename,
and we override gnulib with a rename() replacement that can xalloc_die.
* gl/modules/link-tests.diff: New file.